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Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Dendrites in agate
Inclusions of hematite in aquamarine, Tanzania
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Natural etching structure on a crystal face of diamond (trigons), polarised light
Two-phase inclusions in sapphire, Sri Lanka
Midge included in amber from the Baltic coast, polarised light
Stress fissure («sun spangle») in baltic amber

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